Abstract: Benxi-Huanren in eastern Liaoning Province, where the Paleozoic strata are well developed, is a typical area for stratigraphic and sedimentological study. Based on the theory and concept of event stratigraphy and division of main geological events, with the 1:50000 regional geological survey and stratigraphic section measurement, the Paleozoic strata in the region is divided into 6 event stratigraphic units, i.e. tectonic uplift, depresion, transgression, hypoxia, windstorm and hot arid, and 8 event clusters. The authors describe each event stratigraphic unit individually, present the concepts of event individual, event cluster, event sediment and event cluster depositional segment, and discuss its correlation with sedimentary environment and sequence stratigraphy.